JPH06199344A - Opening device for packing container - Google Patents

Abstract

PURPOSE: To ease discrimination of an opening strip at the initial stage of tearing the opening strip by preventing wrapping material from tearing to thinner layer with provision of a region impossible to heat-seal at a portion of the opening strip, and providing a mark at an external part of the opening strip. CONSTITUTION: A packaging container 1 is provided with an opening strip 10 inserted in a lateral seal fin 3 of the container 1. The opening strip 10 extends from the spot 11 forming a spout of the container through a longitudinal sealing seam 2 to exterior of the packing container. The opening strip 10 is coated with a region 13 impossible to be heat-sealed at the spot where the strip leaves the lateral seal fin 3 at least at a side of it. The region 13 impossible to be heat-sealed is fused with hatched region 14 of the opening strip 10 lying outside the packaging container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container opening device of the type manufactured from resin-coated packaging material and molded into a tube by means of a longitudinal seal seam, said container being a single container. Displaying sealing fins extending laterally on the wall, the opposing layers of packaging material are fused together at the sealing fins, the opening device being inserted into the sealing fins to provide a longitudinal sealing seam of the packaging container. An opening strip is provided that extends through the exterior of the packaging container.

[0002]

BACKGROUND OF THE INVENTION Within the packaging industry, paper or cardboard cores laminated with thermoplastic materials and possibly metal foils, for example aluminum foil, for the production of single-use disposable packages or paper boxes for milk, juice, etc. Frequently, the packaging materials that they have are used. The package is molded from a continuous web of material or sheet of material. For example, from a web, a parallelepiped package is made by first molding the web into a tube with the longitudinal edges of the web fused together at longitudinal lap seams or joints. The tube is divided into packaging units filled with its intended content and closed by repeated lateral seals of the tube. In this case,
A cushion-like packaging blank is obtained, which is then finally formed into a parallelepiped package.

In order to gain access to the contents of the package in a simple manner, some form of opening device is required. In this case, it is well known in the art to insert a tear strip into one of the transverse seal seams. The opening device is described, for example, in Swedish patent application No. S-9002640-2. By providing the opening strip on the packaging container, an opening device for opening the package is obtained by a simple manual operation, and at the same time, a part of the upper portion of the package is molded into the spout.

The apertured strips are often manufactured from laminated resinous material in which one of the layers breaks upon agglomeration upon opening such that a portion of the apertured strip is left in place inside the packaging material. This is to prevent the packaging material from tearing into thin layers and thus exposing the inner layer of paper or cardboard to liquid contents. However, tearing into a particular thin layer of packaging material during the first stage of the opening process can occur with tear strips of the type described above.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to avoid tearing into the thin layer of packaging material that occurs during the initial stages of tearing an aperture strip. Another object of the invention is to obtain clear and easily identifiable marks on the outer part of the aperture strip.

These and other objects are provided by providing an opening device of the type mentioned in the introduction, characterized in that part of the opening strip is coated on at least one side with a non-heat-sealable layer. Achieved by the invention.

Preferred embodiments of the present invention are further provided with the features recited in the dependent claims of the appended claims. Hereinafter, an embodiment of the apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A packaging container 1 of the type which is formed into a tube by a longitudinal lap joint or lap seam 2 and then cut into individual packages by a lateral seal 3.
Is a continuous material web or punched material sheet,
It may also be manufactured from so-called blanks. The packaging material 4 comprises a paper or cardboard core 5 laminated with various layers of thermoplastic material 6, 7 and possibly metal foil, preferably aluminum foil.
Made of.

FIG. 1 shows a part of a packaging material 4 having a fold line 8 in which the package 1 is folded by its aid in the parallelepiped packaging container 1 during its final shaping. An opening strip 10 is inserted in the region 9 of the packaging container 1 where the lateral sealing is effected and forms the upper sealing fin 3.
The aperture strip 10 extends from a point 11 of the packaging material 4 at which the packaging material 4 is folded into its transverse joint seal 3. The point 11 constitutes the outermost point of the spout at a later stage of the package 1 to be opened. From point 11
The aperture strip 10 extends to the outside of the wrapping material 4 where the outer limiting line 12 of the wrapping material 4 constitutes the outer portion of the longitudinal seal joint or seam 2 of the package.

At the location 12 where the aperture strip 10 does not prematurely contact the packaging material 4 either, the outer limiting edge 1 of the material web 1 is formed.
A region 13 is shown in FIG. 1 which surrounds the two sides and constitutes a region 13 which is covered with a non-heat-sealable layer. This non-heat sealable layer is not heat sealable to polyethylene,
Moreover, it may consist of some form of printing ink of the type resistant to the germicidal liquid used in the filling machine. Opening strip 1 which surrounds the edge line 12 of the packaging material 4 on both sides
In the 0 marked area 13, this non-heat-sealable layer is printed over one side of the strip 10 completely. The other side of strip 10 may also be coated with a non-heat sealable layer. However, experiments have shown that a good opening of the package 1 can be obtained with only one side of the strip 10 to be coated. Upon application to the packaging material 4, the opening strip 10 is oriented such that the non-heat-sealable layer faces towards the inner layer 7 of the packaging material 4. The area 13 covered with the non-heat-sealable layer is about 4 mm to about 6 mm of the opening strip 10 by a certain tolerance for attachment so that it always extends 2 mm to 3 mm on both sides of the outermost edge 12 of the packaging material 4. Make up.

By using a non-heat-sealable layer of printing ink of a color different from that of the rest of the packaging container 1, the opening strip 10 is arranged by hatching on the remainder 14 of the projecting opening strip 10. It is possible to obtain a color mark indicating the place. If a printing ink color different from that of the non-heat-sealable layer is used, then some degree of hatching should be used sufficient to provide easy identification of the aperture strip 10. Opening strip 10 on outer finished package 1 is package 1
It should not be hatched more closely than would allow it to be fixed to the outside of the. A suitable degree of hatching is
20% to 70% of the surface.

FIG. 2 shows the upper part 15 of a preformed package 1 with an opening device according to the invention. In the packaging container 1 of FIG. 2, one gable flap 16 to form a spout is lifted from its lowered distribution position. The aperture strip 10 is shown against the upper side 15 of the packaging container 1. The opening strip 10 starts at the region 13 covered with the non-heat-sealable layer and extends out through the longitudinal sealing joint or seam 2 of the package 1 and then to the outside of the packaging container 1. The area 14 of the apertured strip 10 that is hatched begins a distance outside the longitudinal seal seam 2. Aperture strip 1 given the degree of hatching so that a particular seal is still possible
The 0 is fixed to the upper side 15 of the packaging container 1 by a point seal 17 so as to avoid the risk of being caught by another package 1 during distribution and handling.

FIG. 3 shows the upper sealing fin 3 of the packaging container 1.
2A and 2B show how the aperture strips 10 can be stacked. An outer layer 19 of a sealable resin material, preferably polyethylene, is laminated around an inner layer 18 of tensile strength material, preferably polyester.
Between the inner layer 18 and the outer adhesive layer 19, the adhesive bond between all the material layers contained in the opening strip 10 and the outer layer 19 of the opening strip and the inner thermoplastic layer 7 of the packaging material. There is an intermediate layer 20 of a material whose properties are such that the adhesive bond strength between them is significantly greater than the internal cohesive bond strength of the intermediate layer 20 itself.

FIG. 4 shows the packaging container 1 in the process of being opened, the opening strip 10 being removed from its point seal 17 on the upper side 15 of the packaging container 1 and pulled upwards. The apertured strip 10 is then broken into agglomerates in the layer 20 as shown in FIG. Since the opening strip 10 in the first stage of the opening operation is covered in the region 13 with a non-heat-sealable layer which extends onto the edge 12 of the packaging material 4, the opening strip 10 is torn when it tears. Edge 1
2 and thus cannot break the packaging material 4 into thin layers. Simultaneously with the pulling of the aperture strip 10 upwards, a molding of the spout is obtained which facilitates the liquid content. By providing pre-made perforations in the sealing fin 3 of the packaging material 4, the spout can be easily and clearly formed, and thus the opening strip 10
After tearing, it is possible to pour the contents directly from the package.

As is apparent from the above description, the present invention is
An opening device is realized which has an opening strip 10 which is inserted into the upper sealing fin 3 of the packaging container 1, which strip does not have the problems and drawbacks inherent in the opening strips of the prior art. At the same time, the position of the opening strip 10 is directly indicated, which gives a color indication which facilitates the opening of the package 1.

The invention is not to be considered limited to what has been shown and described, and many modifications are conceivable without departing from the spirit and scope of the appended claims.

[Brief description of drawings]

FIG. 1 is a partial view of a wrapping material into which an opening strip is inserted.

FIG. 2 is a view of the top of an unopened packaging container with an opening device according to the invention.

FIG. 3 is a cross-sectional view of a seal fin of an unopened packaging container.

FIG. 4 is a view of the packaging container in the process of opening.

FIG. 5 is a cross-sectional view of the sealing fin of the packaging container during the opening operation.

[Explanation of symbols]

 1 packaging container (package) 2 lap joint (lap joint) 3 lateral joint seal (upper seal fin) 4 packaging material 7 inner layer 10 opening strip 12 outer limit line (edge) 13 non-heat-sealable layer region 14 hatching Area 15 Upper (upper) 20 Intermediate layer

Claims (7)

[Claims] 1. Seal fins (3) of the type made from resin-coated packaging material (4) and formed into tubes by longitudinal sealing seams (2), which extend laterally over one container wall. ), The opposing packaging material layers (7) are fused together at the sealing fins, are inserted into the sealing fins (3) and pass through the longitudinal sealing seam (2) of the packaging container (1). An opening device for a packaging container (1) comprising an opening strip (10) extending to the outside of the packaging container (1), the opening strip (1)
Opening device, characterized in that part or region (13) of 0) is coated with a layer which cannot be heat sealed. 2. The opening device according to claim 1, wherein the non-heat-sealable layer faces the interior of the packaging container (1) at a longitudinal sealing seam (2) of the packaging container (1). An opening device, characterized in that it is arranged on the side of said opening strip (10) which is directed towards. 3. The opening device according to claim 1, wherein the non-heat-sealable layer is the longitudinal seal seam (2).
An opening device starting from the inside of the container and extending a predetermined distance to the outside of the packaging container (1). 4. The opening device according to claim 1, wherein the region (13) with the non-heat-sealable layer is from 2 mm on both sides of the outermost edge (12) of the packaging material (4). An opening device characterized by extending 3 mm. 5. The opening device according to claim 1, characterized in that the region (13) of the non-heat-sealable layer extending outside the packaging container (1) merges into the hatched region (14). And opening device. 6. The opening device according to claim 5, wherein the degree of the hatching is 20% to 70%. 7. The opening device according to claim 1, wherein the opening strip (10) is of a type of laminate that breaks the agglomeration in one layer (20) during opening of the packaging container (1). An opening device characterized by being made.